Oil-well-tool jar



E. S. HARTSON oIL WELL TooL JAR June 18, 1929.

Filed 'May 9, 1928 Patented June 1s, 1929.`

1,717,972 PATENT oFFICE.

mans. Hanson, orrio's ANGELES, cALIroRNIa.

oIL-wnLr.-'.roor. Jan.

application' mea my s, 192s. serial No. 276,412.

y invention relates generally to deep well drilling apparatus and more particularly to an oil well tool jar,l that is a device that may be utilized for jarrin or hammering a drill bit or like tool in t e event that the same becomes stuck during well drilling operations, andthe principal objects of my invention are to generally improve upon and simpli the construction of the existin forms o oil well tool jars and to provide a device of `the character referred to that is relatively simple in construction, inexpensive to manufacture, capable of bein readily assembled or taken apart, and W ich is strong and durable in construction so as to eifectlvely withstand the heavy strains and rough usage to which vthe tool is subjected.

With the foregoing and other objects in view, my invention consists in certain novel :features of construction and arrangement of parts that will hereinafter be more fully described and claimed'and illustrated in the d accompanying drawing, in which- Fig. 1 1s a vertical section taken lengthwise through the center of the oil well 'tool jar embodying the principles of my invention;

Fig. 2 is an enlarged horizontal section taken on the line 2--2 of Fig. 1.

Fig. 3 is a horizontal section taken on the iin@ 3 3 of Fig. 1. i

Fig. 4 is a horizontal section taken on the line 4-4 'of Fig. 1.

Fig. 5 is a horizontal section taken on the line 5 5 of Fig. 1. i

Referring by numerals to the accompany- Y ing drawings which illustrate a practical embodiment of my invention, 10 designates the upper member of the body of the jar,

er member is substantially cylindrical in orm and provided with an axially disposed circulation duct 11. `:The upper portion of the member 10 is externally threaded as designated by 12 in order that it maybe detachably connected to the lower portion of the drill stem, and the lower portion of memberlO is externally threaded in order that it may be screwed into the internally threaded upper portion of the intermediate member 13 of the body of the tool yand which 'intermediate memberV has the same external diameter as the upper member 10. f

The lower portion of the intermediate member 13 is internally threaded so as to lreceive the threaded pin 14 on the upper end of the lower member 15 of the body of the tool, and which lower member has the same external diameter as the upper memberA 10 and intermediate member 13.

Extending axially through the intermediate member 13, the lower member 15 and the external pin that depends from the u per member 10, is a. tubular mandrel 16, t e lower end of which is externally threaded as designated by 17 i order that it may be screwed into the box of a well drilling tool.

Arranged to slide freely upon the upper portion of the mandrel 16 is a sleeve 18 which performs the functions of a jar or hammer and formed integral with the upper end of this sleeve is a circumferential flan 19 that is adapted to move vertically within a cylindrical chamber 20 that is formed in the threaded stem that depends from the upper member 10, and said chamber extend ing a short distance downwardly in the upper portion of intermediate member 13.

Formed in .the up er portion of the mandrel 16 is a circum erential groove 21 and formed through the upper portion of the jar of hammery 18 is a diametrically arran ed slot 22 within which is arranged for slidlng movement a latchin plate'23 in which is formed a short longitudinally disposed slot 24 of sufficient size to permit the passage of the mandrel 16.

.Secured in any suitable manner to the outer face of sleeve 18 a short distance below the slot 22 and plate 23 that operates therein, is the lower end of a flat spring 25, the upper free end of whichv bears against the rear end of the latching plate.

The forward lower corner of the latching plate 23 is rounded or beveled as designated by 26 in order that it will engage and ride past the shoulder 27 that is formed in intermediate member 13 at` the lower end of the chamber 20.

Formed through the intermediate member 13 and Athrough the pin 14 that projects upward from the lower member 15 is a chamber 28 through which the jar or hammer is adapted to slide and arranged within this chamber and surrounding the tubular mandrel is a relatively sti' expansion spring 29,- the upper end of.which bears against the lower end of the jaror hammer 18 and the lower end of said spring rests 0n the bottom of the chamber 28.

Formed within the lower member 15 and communicating with the opening theres ,ed by means of a welded joint from the upper end of through that is occupied by the mandrel 16A is a pluralit of longitudinally disposed slots 30 `provided at their upper ends with abrupt shoulders 31 and at their lower ends with shoulders 32, and projecting into thesev slots are lugs 33 that are formed integral with the lower portion of the mandrel 16.

y In order that the lower portion of the'` y stuck or anchored in the formation at the bottom of the well hole.

It will be understood is made ready for use the latch plate 23 is moved to its forward limit of movement under the influence of the spring 25 and when so positioned that portion of the latch plate to the rear of slot 24 engages in the 21 in the mandrel, thereby locking t e jar or hammer 18 to said mandrel.

After-the mandrel has, been connected to the upper end ofthe tool'that is stuck or anchored, the drill pipe to which the,body of the jar is connected is drawn u ward, and during such movement the man rel 16 and thejar or hammer 18 remain stationary and -When the body of the tool u}pward to a point where the shoulders 32 at t e lower end of the slot 30 en age the unspring 29which bears against the lower end of the jar or hammer will be compressed and therefore put'under tension. i

has been drawn der faces or lugs 33 the shoul er 27 at the lower end of chamber 20 will bear against the lower rounded corner. 26 at the forward end of latch plate 23, thereby movingsaid latch plate a slight distance rearwardly against the resistance oiered by spring 2 5 and as that portion of the latch plate to the rear of slot 24 passes out of groove 21, spring 29 will act to instantly'move the hammer 18 upwardly with considerable force andthe upper end thereof carr ing the flange 19 will strike lagainst'the s oulder at the upper end of chamber 20 and the force of this blow will be transmittd throu h the body of the tool to the lugs t33 by t e shoulders 32 that are in enga ement with said lugs and thus an up'war force tending to dislodge the stuck tool will be exerted on the mandrel that is connected to said tool.

The drill tube and body of the tool are v 'new lowered with a puck movement and the force produced b'y t that when the tool covee weight of the drill tubewill be transmittedv from the body of the tool through the shoulders 31 on to the tops of the lugs 33, thereby producing a driving blow upon the mandrel that' is connected to the stuck tool.

The operations just described are repeated and as a result thev force of the developed blows is transmitted to the mandrel and tool first in an upward direction and then in a downward direction, vand which action will be effective in` releasing the stuck or anchored tool. v

It will be understood that when the drill pipe and tool are lowered rto produce a downward blow upon the mandrel as just described, the latch plate 23 will be moved forward under the influence of spring 25 so as to re-engage in the groove 21 and lock the hammer to the mandrel, which action occurs when the groove 21 aligns with the slot 22 that is occupied by the latch plate.

Thus it will be seen that I have provided an oil well tool 'ar that isr relatively simple in construction, inexpensive to manufacture, and very eiective for performing the functions for .which Vit is intended.

' shown and described without departing from the spirit of my invention, lthe scope of which is set forth in the appended claims.

I claim as my invention:

1. In an oil well tool jar, a 'cylindrical' body ada ted to be connected to the lower end of av rill tube,'a mandrel arranged for sliding movement within said cylindrical body, cooperating shouldersformed on said mandrel and cylindrical body, a tubular hammer arranged .for sliding movement on the upper portion of said mandrel, an lexpansive spring arranged beneath said hammer, and means for latching the hammer to said mandrel during the upward movement of the cylindrical body relative to said. mandrel. v

2. In an oil well tool jar, a cylindrical body adapted to be connected to the lower end of a'drill tube, a mandrel arranged for sliding movement within said cylindrical body, cooperatin shoulders formed on vsaid mandrel. and cy indrical body, a tubular hammer arranged for sliding movement on the upper portion of said mandrel, an expansive spring arranged beneath said hammer, means for latching the hammer to said mandrel during the upward movement of the cylindrical body relative to said andrel, and means for releasing said latchin means to permit the upward travel of the ammer un er the influence of said spring.V

3. In an oil well tool jar, a cylindrical body, a tubular mandrel axially arranged within said body, lugs on said `tubular mandrel, slots arranged within said body for the accommodation of said lugs, a spring pressed tubular hammer arranged for sliding movement upon said mandrel within said body,

5 and means for locking said hammer to said mandrel during the upward movement: of the cylindrical body relative to said mandrel. 4. In an oil Well tool jar, acylindrical body, a tubular mandrel axially arranged lugs on said tubular man- 1o within said body,

drel, slots arranged within said body for the accommodation of said lugs, a spring pressed tubular hammer arranged for sliding movement upon said mandrel within said body, means for locking said hammer to said mandrel during the upward movement of the cylindrical body relative to said mandrel, `and cdoperting shoulders on said hammer and cylinderbody.

In testimony whereof I allx my signature.

EARL S. HARTSON. 

